// **二、基于以下代码完成下面的四个练习**

// 练习3：使用帮助函数_average重构averageDollarValue，使用函数组合的方式实现

const fp = require('lodash/fp')
// 数据
// horsepower 马力
// dollar_value 价格
// in_stock 库存
const cars = [
    {name: 'Ferrari FF',horsepower: 660,dollar_value: 700000,in_stock: true},
    {name: 'Spyker C12 Zagato',horsepower: 650,dollar_value: 648000,in_stock: false},
    {name: 'Jaguar XKR-S',horsepower: 550,dollar_value: 132000,in_stock: false},
    {name: 'Audi R8',horsepower: 525,dollar_value: 114200,in_stock: false},
    {name: 'Aston Martin One-77',horsepower: 750,dollar_value: 185000,in_stock: true},
    {name: 'Pagani Huayra',horsepower: 700,dollar_value: 130000,in_stock: false},
]

let _average = function (xs) {
    console.log(xs)
    return fp.reduce(fp.add, 0, xs) / xs.length
} // <- 无需改动

// let averageDollarValue = function (cars) {
//     let dollar_values = fp.map(function (car) {
//         return car.dollar_value
//     }, cars)
//     return _average(dollar_values)
// }
/**
 * 答案在这里
 */
let averageDollarValue = fp.flowRight(_average, fp.map(car => car.dollar_value))
console.log(averageDollarValue(cars))